Boiler-furnace.



NITED STATES PATENT OFFICE.V

HENRY ALONZO. BUCK, OF STAFFORD, CONNECTICUT.

BOILER-FURNACE.

SPECIFICATION forming part vof Letters Patent No. 666,180, dated January 15, 1901.

Application liled September 10, 1900. Serial No. 29,603. (No model.)

To a/ZZ whom it may con/cern.-

Be it known that I, HENRY ALONZO BUCK, a citizen of the United States of America, residing at West Staord, Connecticut, have invented new and useful Improvements in Boiler-Furnaces, of which the following is a specification. o

My invention relates to a boiler-furnace of the kind in which the air necessary for combust-ion is passed through a suitable tubular system. This manner of providing the air for combustion, according to the present invention, does not aim at forcing combustion in the manner of similar known furnaces, its object consisting solely in passingthe products of combustion through a conduit in which are arranged the air-supply pipes and the discharge-pipe for the steam or hot water.

In this conduit may also be arranged the Water-feeding pipes. It will be easily linderstood that by such arrangement the air necessary for combustion is preliminarily heated, while the steam or the hotwater drawn 0H will be additionally heated or dried, although not superheated and in the best case protected in a most effective manner against loss of heat through radiation.

In the accompanying drawing the invention is represented as arranged in connection with a tubular boiler which is shown in section. In this arrangement it is immaterial whether the boiler is connected with a special steam-chamber or whether the nal product is only hot water which is to be delivered at a suitable place.

The fire-box a receives the air necessary for combustion from below the fire grate b through a pipe c, terminating in a rose, nozzle, or perforated end. Both the doors of the lire-box and of the ash-pit are so tted that they can be closed in an air-tight manner. The fire-gases pass along, as indicated by the arrows, heating on their way the Water circulatingin the boiler and passing out finally into a passage d, in which they are led before being allowed to escape into the chimney close to the place where the steam or hot Water is to be used.

The air-supply pipe c is supplied with the air required for combustion by a ventilator or othersuitable blast device. The same end can also be obtained by arranging an exhauster in a suitable portion of the passage d. Inasinuch as the greatest part of the airsupply pipe c is contained within the passage d, it will be understood that the air before reaching the grate will have received a considerable amount of heat.

The steam or the hot water is drawn oi at e. The steam or the water may also be passed through a serpentine coil f, provided around the front portion of the boiler. In either case the heated product is passed into a pipe g, which carries it to the place where it is required; but even this pipe g passes, in accordance with the principle of this invention, through the said passage d in such a manner that the fluid contained in the pipe g (hot water or steam) is further heated in the passage d or at least protected against loss of heat. 1

The water is supplied tothe boiler through a pipe h, which is also placed in the said passage d in such a manner that the water acquires at the expense of the escaping firegases a considerable degree of heat before reachingr the boiler.

I claim- 1. In a water-tube boiler, the combination with afurnace; of the water-tubes, arranged above said furnace, a series of pipes within said furnace to receive the steam from said Water-tubes, a pipe g for conducting steam away from said pipes, and means for heating the pipe g, a series of su perheating-pipes also arranged within said furnace, and a returnpipe for conducting the steam after being used once to saidsuperheating-pipesg and means for heating said return-pipe; substantially as described.

2. In a water-tube boiler, the combination with a furnace; of the water-tubes, arranged above said fu rnace,a series of pipes arranged at right angles above and below said watertubes within said furnace to receive the steam from said water-tubes, a pipe g for conducting steam away from said pipes, and means for heating the pipe g, a series of superheating-pipes also arranged within said furnace and at right angles above and below said water-tubes, and a return-pipe for conducting the steam after being used once to said superheating-pipes; and means forheating said return-pipe; substantially as described.

IOO

3. Ina water-tube boi1er`, the combination l with a furnace, and means for introducing warm air below the grate in said furnace; of the Water-tubes arranged above said furnace, a series of pipes f arranged at right angles with said Water-tubes to receive the steam. therefrom, a pipe g connected with said series of pipes f for conducting the steam away and means for heating said pipe g, a series of snperheating-pipes arranged at right angles to said water-tubes in the furnace, a returnpipe for conducting the steam after being once used to said superheating-pipes, and means for heating said retu rn-ppe; subst-antially as described.

In testimony whereof I have signed my name to this specification inthe presence of 

